Isotopic r-process abundances and nuclear structure far from stability - Implications for the r-process mechanism

Details Isotopic r-process abundances and nuclear structure far from stability - Implications for the r-process mechanism Isotopic r-process abundances and nuclear structure far from stability - Implications for the r-process mechanism

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403..216k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 403, no. 1, p. 216-238.

Astronomy and Astrophysics

Astrophysics

203

Abundance, Capture Effect, Isotopes, Nuclear Astrophysics, Supernovae, Actinium, Astronomical Models, Half Life, Radioactive Decay

Scientific paper

The study employs the full isotopic r-process abundances in nature and a unified model for all nuclear properties involved to uniquely deduce the conditions necessary to produce such an abundance pattern. The nature of the steady-flow equilibrium of beta decays between isotopic chains is also investigated. Strong evidence is found to the effect that a steady flow was not global but only local in between neighboring peaks, which requires time scales not much longer than 1 s. The remaining odd-even effects in observed abundances indicate that neutron densities dropped during freeze-out by orders of magnitude on time scales close to 0.04 s. A set of n(n)-T conditions is presented as a test for any astrophysical r-process site. The way remaining deficiencies in the produced abundance pattern can be used to extract nuclear properties far from stability is also shown.

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